STCC C30 vs WTCC C30

With the steam update obviously the STCC C30 has gained 25kg and the WTCC C30 remains the same but am i correct in thinking the WTCC C30 was 45kg heavier to start with than the STCC version as in real life?

And I think the C30 is also belonging to the 'National S2000'-group
3.3.1.3 Bilar i enlighet med STCC Nationell Super 2000. Minimivikter på bilar i enlighet med STCC Nationell Super 2000 kommer att fastställas individuellt efter förbesiktning och eventuell testkörning.
Cars that belong to National S2000. Minimum weight of STCC National will be determined individually by research and a possible test run.